Towelling material should ALWAYS be washed before first use. Wash towels normally at 40° - but they can take 60° and even more, especially if someone has decided to use them for removing make-up rather than drying bodies. Dry cleaning is pointless.
Do not use bleach, and wash dark colours separately.
To keep towels soft and fluffy, tumble drying is best. If line-drying, don't overdo it, unless you like sandpaper.
Biological powders contain natural enzymes that chop up proteins and fats. These have not been allergenic since the 1970's, but they are largely ineffective above 40°.
Towels have looped threads which occasionally break : just cut them off.